Implementation method of elevator safety circuit

Abstract

The invention discloses an implementation method of a safety circuit, which is characterized in that a pit circuit board acquires the safety switch state of a pit through two channels, and uploads the safety switch state to a control cabinet circuit board through a safety bus; the car roof circuit board collects the states of safety switch and door area signals of the car roof through double channels and uploads the states to the control cabinet circuit board through a safety bus. The control cabinet circuit board collects the safety switch state of the machine room through the two channels and outputs the final state of the safety circuit through the two channels according to the instruction of the elevator main control board. Safety switch information is collected nearby, the function of an elevator safety circuit is completely achieved through software, cables are saved, and safety switch detection is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator control, and in particular to a method for realizing an elevator safety circuit. Background Art

[0002] The elevator safety circuit currently uses cables to connect the scattered safety switches in series to provide the elevator's safety status. This requires many cables and is costly. In addition, the status of each switch cannot be detected, so troubleshooting takes a long time.

[0003] When the elevator is pre-opening the door and re-leveling, the physical switch circuit is short-circuited through the safety circuit board; the door lock bypass also uses a physical switch to bypass the physical door lock circuit; the cost is high.

[0004] At present, the electronic programmable safety circuit PESSRAL has been used in the elevator industry, and the safety communication technology has matured and has been widely used in the field of automatic control. These two technologies can be used to innovate the design of traditional safety circuits.

[0005] Chinese invention patent application publication number CN115196454A discloses a safety control device for a personnel transporter. The safety control device includes: a first safety control channel configured to output a first safety control signal in response to one or more input signals; a second safety control channel configured to output a second safety control signal in response to one or more input signals; and an override control channel configured to: monitor the health of the first safety control channel and the second safety control channel; determine whether a fault has occurred in either the first safety control channel or the second safety control channel; and override the first safety control signal or the second safety control signal in response to a determination that a fault has occurred in the corresponding safety control channel.

[0006] Chinese invention patent application publication number CN103079981A discloses an elevator safety system, including a controller and a shaft safety node arranged at a pit portion of an elevator shaft. The shaft node is operatively connected to one of a lower shaft device and a pit safety device arranged at the elevator pit. A first bus links the shaft node and the controller. The first bus directly transmits a communication signal from the shaft node to the controller. A car node is arranged in an elevator car. The car node is operatively connected to a car safety device arranged at the elevator car. A second bus links the car node and the controller. The second bus directly transmits a communication signal from the car node to the controller.

[0007] Chinese invention patent application publication number CN110316627A discloses an elevator safety system, in which a safety assessment unit communicates with a car safety node through a first serial bus, communicates with a control cabinet through a second serial bus, and is connected to an emergency electric operation device through a wiring harness; the car safety node is connected to a car top maintenance operation device through a wiring harness; the car safety node receives a car top maintenance operation function signal, a car top maintenance up confirmation signal, and a car top maintenance down confirmation signal from the car top maintenance operation device, and sends it to the safety assessment unit through the first serial bus; the emergency electric operation device is used to send an emergency electric operation function signal, an emergency electric operation up confirmation signal, and an emergency electric operation down confirmation signal to the safety assessment unit.

[0008] Chinese invention patent application publication number CN110316628A discloses an elevator safety system, in which an evaluation unit is connected to a car absolute position sensor via a first serial bus, connected to a car safety node via a second serial bus, and directly connected to a shaft safety device via a wiring harness; the car absolute position sensor sends the real-time position and speed value of the car to the evaluation unit; the car safety node is connected to the car safety device via a wiring harness, receives the car safety device status information and transmits it to the evaluation unit; the evaluation unit outputs a speed safety signal according to the car speed value, outputs an unexpected deceleration signal according to the car speed value and the real-time position of the car, and outputs a signal whether the car moves unexpectedly when the door is open according to the car safety device status information, the shaft safety device status information, the car speed value and the real-time position of the car.

[0009] WO2018087803A1 discloses an elevator control device, a control method, and an elevator. The elevator control device has a first system power supply control component that controls the power supply from the safety device power supply to the safety device, one end of which is connected to a safety device that stops the operation of the car and is driven by the power provided by the safety device power supply, and the other end is connected to the safety device power supply. In addition, the elevator control device has a second system power supply control component connected in parallel with the first system power supply control component. Moreover, the elevator control device has a safety controller that switches the operation of the first system power supply control component and the second system power supply control component every specified time, and diagnoses the operation of the first system power supply control component and the second system power supply control component.

[0010] The above patent applications are all unable to collect safety switch information nearby, and all require cable connections, which have complex line structures and high costs. Summary of the invention

[0011] One of the technical problems to be solved by the present invention is that the above-mentioned prior art cannot collect safety switch information nearby and needs to use cable connection. Therefore, a method for realizing an elevator safety circuit that can collect safety switch information nearby and does not need to use cable connection is provided. The method uses electronic programmable PESSRAL technology and safety communication technology to collect the safety switch status of the pit through the pit circuit board, and upload it to the control cabinet circuit board using the safety bus technology; the car top circuit board collects the status of the safety switch and door zone signal on the car top, and uploads it to the control cabinet circuit board using the safety bus; the control cabinet circuit board collects the safety switch status of the machine room, and outputs the final status of the safety circuit according to the instructions of the elevator main control board, thereby realizing: using software and electronic technology to realize a complete elevator safety circuit; using software and electronic technology to realize the door lock circuit short-circuit function; using software and electronic technology to realize the door lock bypass function; each safety switch is detected, and the quick and accurate positioning of the safety circuit disconnection can be realized.

[0012] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0013] A method for implementing a safety circuit, characterized in that a pit safety board collects the status of each safety switch in the pit through dual channels and uploads it to a control cabinet safety board through a safety bus; a car top safety board collects the status of each safety switch and door zone signal on the car top through dual channels and uploads it to the control cabinet safety board through a safety bus; the control cabinet safety board collects the status of each safety switch in the machine room through dual channels; the pit safety board, the car top safety board and the control cabinet safety board output the final status of the safety circuit through dual channels according to the instructions of the elevator main control board.

[0014] In a preferred embodiment of the present invention, the safety switches of the pit are a pit emergency stop switch, a pit inspection switch, a pit inspection up button, a pit inspection down button, a lower limit switch, a car buffer switch, a counterweight buffer switch and a tensioner pulley switch which are arranged on the pit circuit board.

[0015] In a preferred embodiment of the present invention, the safety switches on the car top are a car top emergency stop switch, a car top maintenance switch, a car top maintenance up button, a car top maintenance down button, a safety clamp switch, a telescopic guardrail switch, a front car door lock switch, a rear car door lock switch, a maintenance platform fixing switch, a maintenance limit switch and a safety window switch arranged on the car top circuit board.

[0016] In a preferred embodiment of the present invention, the safety switches of the machine room include a machine room emergency stop switch, an emergency electric switch, an emergency electric up button, an emergency electric down button, a speed limiter switch, a front door lock switch, a rear door lock switch, an upper limit switch, a turning handwheel switch, a car door lock bypass switch and a floor door lock bypass switch arranged on the control cabinet circuit board.

[0017] In a preferred embodiment of the present invention, the elevator main control board issues a door lock bypass instruction when the elevator needs to pre-open the door, pre-operate, or re-level.

[0018] In a preferred embodiment of the present invention, the final state of the safety circuit outputted through the dual channels is outputted using one of relays, voltage, current, light, and magnetism, or a combination of any two or more thereof.

[0019] In a preferred embodiment of the present invention, when any of the pit inspection switch and the pit emergency stop switch in the pit circuit board, the car top inspection switch and the car top emergency stop switch in the car top circuit board, the emergency electric switch and the machine room emergency stop switch in the control cabinet circuit board are actuated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

[0020] In a preferred embodiment of the present invention, the control cabinet safety panel is actuated by the pit maintenance up button or the pit maintenance down button, and when the pit maintenance switch is actuated, the pit maintenance switch on the pit circuit board is short-circuited; the control cabinet safety panel is actuated by the car top maintenance up button or the car top maintenance down button on the car top circuit board, and when the car top maintenance switch is actuated, the car top maintenance switch on the car top circuit board is short-circuited; the control cabinet safety panel is actuated by the emergency electric up button or the emergency electric down button on the control cabinet circuit board, and when the emergency electric switch on the control cabinet circuit board is actuated, the emergency electric switch on the control cabinet circuit board is short-circuited.

[0021] In a preferred embodiment of the present invention, when any of the counterweight buffer switch and car buffer switch on the pit circuit board, the safety clamp switch on the car top circuit board, the upper limit switch on the control cabinet circuit board, the lower limit switch on the pit circuit board, and the speed limiter switch on the control cabinet circuit board are actuated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

[0022] In a preferred embodiment of the present invention, when the pit inspection switch on the pit circuit board and the car top inspection switch on the car top circuit board of the control cabinet safety board are not operated, and when the emergency electric switch on the control cabinet circuit board is operated, the counterweight buffer switch, the car buffer switch and the lower limit switch on the pit circuit board, the safety clamp switch on the car top circuit board, the upper limit switch and the speed limiter switch on the control cabinet circuit board are short-circuited, and any one of them is operated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

[0023] In a preferred embodiment of the present invention, when any of the tensioner switch on the pit circuit board, the telescopic guardrail switch on the car top circuit board, the maintenance platform fixing switch, the maintenance limit switch, the safety window switch, the front car door lock switch and the rear car door lock switch, and the front layer door lock switch and the rear door lock switch on the control cabinet circuit board of the control cabinet safety board is actuated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

[0024] In a preferred embodiment of the present invention, when the elevator main control panel gives a door lock bypass instruction and the door zone switch on the car top circuit board is actuated, the control cabinet safety panel short-circuits the front car door lock switch and the rear car door lock switch on the car top circuit board and the front layer door lock switch and the rear layer door lock switch on the control cabinet circuit board.

[0025] In a preferred embodiment of the present invention, when the car door lock bypass switch on the control cabinet circuit board is actuated, the control cabinet safety board short-circuits the front car door lock switch and the rear car door lock switch on the car top circuit board; when the floor door lock bypass switch on the control cabinet circuit board is actuated, the front floor door lock switch and the rear floor door lock switch on the control cabinet circuit board are short-circuited.

[0026] In a preferred embodiment of the present invention, the pit emergency stop switch, pit inspection switch, lower limit switch, car buffer switch, counterweight buffer switch, tensioner switch, car top emergency stop switch, car top inspection switch, safety clamp switch, telescopic guardrail switch, front car door lock switch, rear car door lock switch, inspection platform fixed switch, inspection limit switch, safety window switch, machine room emergency stop switch, emergency electric switch, speed limiter switch, front door lock switch, rear door lock switch, upper limit switch, turning handwheel switch, car door lock bypass switch and floor door lock bypass switch are used. Break contact detection; or use the pit emergency stop switch, pit maintenance switch, lower limit switch, car buffer switch, counterweight buffer switch, tensioner switch, car top emergency stop switch, car top maintenance switch, safety clamp switch, telescopic guardrail switch, front car door lock switch, rear car door lock switch, maintenance platform fixed switch, maintenance limit switch, safety window switch, machine room emergency stop switch, emergency electric switch, speed limiter switch, front floor door lock switch, rear floor door lock switch, upper limit switch, turning handwheel switch, car door lock bypass switch and floor door lock bypass switch for dynamic contact detection.

[0027] Due to the adoption of the above technical solution, the present invention collects the safety switch information nearby, completely realizes the function of the elevator safety circuit through software, saves cables, and facilitates the detection of each safety switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The system block diagram of the implementation method of the safety loop of the present invention.

[0029] Figure 2 It is a schematic diagram of the electrical principle of the pit circuit board of the present invention.

[0030] Figure 3 The figure is a schematic diagram of the electrical principle of the car top circuit board of the present invention.

[0031] Figure 4 The figure is a schematic diagram of the electrical principle of the control cabinet circuit board of the present invention.

[0032] Figure 5 It is a schematic diagram of the electrical principle of the safety switch of the dual-channel collection pit, the safety switch on the car top and the safety switch in the machine room of the present invention.

[0033] Figure 6 The figure is a schematic diagram of the electrical principle of the method for realizing the safety circuit of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] See also Figure 1 and Figure 6 According to the implementation method of the safety circuit of the present invention, the pit safety board collects the status of each safety switch in the pit through dual channels and uploads it to the control cabinet safety board through the safety bus; the car top safety board collects the status of each safety switch and door zone signal on the car top through dual channels and uploads it to the control cabinet safety board through the safety bus; the control cabinet safety board collects the status of each safety switch in the machine room through dual channels, and the pit safety board, the car top safety board and the control cabinet safety board output the final status of the safety circuit through dual channels according to the instructions of the elevator main control board.

[0036] See also Figure 2 The safety switches of the pit include the pit emergency stop switch PtEstp, the pit maintenance switch PtMnt, the pit maintenance up button PtUp, the pit maintenance down button PtDn, the lower limit switch LSD, the car buffer switch CgBuf, the counterweight buffer switch CtBuf and the tensioner pulley switch which are arranged on the pit circuit board.

[0037] See also Figure 3 The safety switches on the car top include the car top emergency stop switch CgEstp, the car top maintenance switch CgMnt, the car top maintenance up button CgUp, the car top maintenance down button CgDn, the safety clamp switch SCS, the telescopic guardrail switch Balstrd, the front car door lock switch FrntGS, the rear car door lock switch RearGS, the maintenance platform fixed switch CgLok, the maintenance limit switch CgMvLmt and the safety window switch HMS, which are also arranged on the car top circuit board. Door area switches Flr1 and Flr2 are also arranged on the car top circuit board.

[0038] See also Figure 4The safety switches in the machine room include the machine room emergency stop switch PnlEstp, emergency electric switch Emgc, emergency electric up button EmgUp, emergency electric down button EmgDn, speed limiter switch GOV, front door lock switch FrntDS, rear door lock switch RearDS, upper limit switch LSU, turning handwheel switch HndWl, car door lock bypass switch GSByps and floor door lock bypass switch DSByps, which are set on the control cabinet circuit board.

[0039] See especially Figure 5 The hardware of the pit safety board, the car top safety board and the control cabinet safety board of the present invention are basically the same. The input signal InputA is input into the two microprocessors MCU1 and MCU2 through two optical coupling isolation circuits. The two microprocessors MCU1 and MCU2 communicate with the serial communication interface circuit RS485A through two communication loops. The two microprocessors MCU1 and MCU2 communicate with the serial communication interface circuit RS485B through two communication loops. The two microprocessors MCU1 and MCU2 are also connected to the CagFlgPin signal respectively.

[0040] The two microprocessors MCU1 and MCU2 output the safety circuit status to relays Saft RelyA and SaftRelyB (of course, the output safety circuit status can also be another voltage, current, light, or magnetism). The final status of the safety circuit output through dual channels is achieved by using relays to output the final status of the safety circuit. The microprocessor MCU2 is also connected to an external parity pin.

[0041] The elevator main control board issues a door lock bypass command when the elevator needs to pre-open the door, pre-operate, or re-level.

[0042] Special Participation Figure 5 The specific implementation method of the safety circuit of the present invention is as follows:

[0043] When any of the pit inspection switch PtMnt and pit emergency stop switch PtEstp in the pit circuit board, the car top inspection switch CgMnt and car top emergency stop switch CgEstp in the car top circuit board, the emergency electric switch Emgc in the control cabinet circuit board and the machine room emergency stop switch PnlEstp is actuated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

[0044] When the pit maintenance up button PtUp or the pit maintenance down button PtDn is activated and the pit maintenance switch PtMnt is activated, the control cabinet safety board short-circuit the pit maintenance switch PtMnt on the pit circuit board.

[0045] When the car top maintenance up button CgUp or the car top maintenance down button CgUp on the car top circuit board is actuated and the car top maintenance switch CgMnt is actuated, the car top maintenance switch CgMnt on the car top circuit board is short-circuited.

[0046] When the emergency electric up button EmgUp or the emergency electric down button EmgUp on the control cabinet circuit board is actuated and the emergency electric switch Emgc on the control cabinet circuit board is actuated, the control cabinet safety board short-circuits the emergency electric switch Emgc on the control cabinet circuit board.

[0047] When any of the counterweight buffer switch CtBuf and car buffer switch CgBuf on the pit circuit board, the safety clamp switch SCS and counterweight safety clamp switch on the car top circuit board, the upper limit switch LSU on the control cabinet circuit board, the lower limit switch LSD on the pit circuit board, and the speed limiter switch GOV on the control cabinet circuit board are actuated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

[0048] When the pit inspection switch PtMnt on the pit circuit board and the car top inspection switch CgMnt on the car top circuit board of the control cabinet safety board are not activated, and the emergency electric switch Emgc on the control cabinet circuit board is activated, the counterweight buffer switch CtBuf, the car buffer switch CgBuf and the lower limit switch LSD on the pit circuit board, the safety clamp switch SCS and the counterweight safety clamp switch on the car top circuit board, the upper limit switch LSU and the speed limiter switch GOV on the control cabinet circuit board are short-circuited. When any of the switches is activated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

[0049] When any of the tensioner switch on the pit circuit board, the telescopic guardrail switch Balstrd on the car top circuit board, the maintenance platform fixed switch CgLok, the maintenance limit switch CgMvLmt, the safety window switch HMS, the front car door lock switch FrntGS and the rear car door lock switch RearGS, the front layer door lock switch FrntDS and the rear door lock switch RearDS on the control cabinet circuit board of the control cabinet safety board is actuated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

[0050] When the control cabinet safety board gives the door lock bypass command when the elevator main control board and the door zone switches Flr1 and Flr2 on the car top circuit board are actuated, the front car door lock switch FrntGS and the rear car door lock switch RearGS on the car top circuit board, and the front layer door lock switch FrntDS and the rear layer door lock switch RearDS on the control cabinet circuit board are short-circuited.

[0051] When the car door lock bypass switch GSByps on the control cabinet circuit board of the control cabinet safety board is actuated, the front car door lock switch FrntGS and the rear car door lock switch RearGS on the car top circuit board are short-circuited; when the floor door lock bypass switch DSByps on the control cabinet circuit board is actuated, the front floor door lock switch FrntDS and the rear floor door lock switch RearDS on the control cabinet circuit board are short-circuited.

[0052] You can use the pit emergency stop switch PtEstp, pit maintenance switch PtMnt, pit maintenance up button PtUp, pit maintenance down button PtDn, lower limit switch LSD, car buffer switch CgBuf, counterweight buffer switch CtBuf, tensioner switch, car top emergency stop switch CgEstp, car top maintenance switch CgMnt, car top maintenance up button CgUp, car top maintenance down button CgDn, safety clamp switch SCS, telescopic guardrail switch Balstrd, front car door lock switch FrntGS, rear car door lock switch RearGS, maintenance platform fixed switch CgLok, maintenance limit switch CgMvLmt, safety window switch HMS, machine room emergency stop switch PnlEstp, emergency electric switch Emgc, emergency electric up button EmgUp, emergency electric down button EmgDn, speed limiter switch GOV, front door lock switch FrntDS, rear door lock switch RearDS, upper limit switch LSU, turning handwheel switch HndWl, car door lock bypass switch GSByps and floor door lock bypass switch DSByps moving and breaking contact detection, also You can use the pit emergency stop switch PtEstp, pit maintenance switch PtMnt, pit maintenance up button PtUp, pit maintenance down button PtDn, lower limit switch LSD, car buffer switch CgBuf, counterweight buffer switch CtBuf, tensioner switch, car top emergency stop switch CgEstp, car top maintenance switch CgMnt, car top maintenance up button CgUp, car top maintenance down button CgDn, safety clamp switch SCS, telescopic guardrail switch Balstrd, front car door lock switch FrntGS, rear car door lock switch RearGS, maintenance platform fixed switch CgLok, maintenance limit switch CgMvLmt, safety window switch HMS, machine room emergency stop switch PnlEstp, emergency electric switch Emgc, emergency electric up button EmgUp, emergency electric down button EmgDn, speed limiter switch GOV, front door lock switch FrntDS, rear door lock switch RearDS, upper limit switch LSU, turning handwheel switch HndWl, car door lock bypass switch GSByps and floor door lock bypass switch DSByps.

Claims

1. A method for implementing a safety circuit, characterized in that: The pit safety board collects the status of each safety switch in the pit through dual channels, and uploads it to the control cabinet safety board through the safety bus; the car top safety board collects the status of each safety switch and door zone signal on the car top through dual channels, and uploads it to the control cabinet safety board through the safety bus; the control cabinet safety board collects the status of each safety switch in the machine room through dual channels; the control cabinet safety board then outputs the final status of the safety circuit through dual channels according to the instructions of the elevator main control board.

2. A method for implementing a safety circuit according to claim 1, characterized in that: The safety switches of the pit include a pit emergency stop switch, a pit inspection switch, a pit inspection up button, a pit inspection down button, a lower limit switch, a car buffer switch, a counterweight buffer switch and a tensioner pulley switch, etc., which are arranged on the pit circuit board.

3. The method for implementing a safety circuit according to claim 1, characterized in that: The safety switches on the car top include a car top emergency stop switch, a car top maintenance switch, a car top maintenance up button, a car top maintenance down button, a safety clamp switch, a telescopic guardrail switch, a front car door lock switch, a rear car door lock switch, a maintenance platform fixed switch, a maintenance limit switch and a safety window switch, etc., which are arranged on the car top circuit board.

4. The method for implementing a safety circuit according to claim 1, characterized in that: The safety switches in the machine room include the machine room emergency stop switch, emergency electric switch, emergency electric up button, emergency electric down button, speed limiter switch, front door lock switch, rear door lock switch, upper limit switch, turning handwheel switch, car door lock bypass switch and floor door lock bypass switch, etc., which are set on the control cabinet circuit board.

5. The method for implementing a safety circuit according to claim 1, characterized in that: The elevator main control board issues a door lock bypass command when the elevator needs to pre-open the door, pre-operate, or re-level.

6. The method for implementing a safety circuit according to claim 1, characterized in that: The final state of the safety circuit outputted through the dual channels is outputted through one of relays, voltage, current, light, and magnetism, or a combination of any two or more of them.

7. The method for implementing a safety circuit according to claim 1, characterized in that: When any of the pit inspection switch and pit emergency stop switch in the pit circuit board, the car top inspection switch and car top emergency stop switch in the car top circuit board, the emergency electric switch and the machine room emergency stop switch in the control cabinet circuit board are actuated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

8. A method for implementing a safety circuit according to claim 7, characterized in that: The control cabinet safety board is actuated by the pit maintenance up button or the pit maintenance down button, and when the pit maintenance switch is actuated, the pit maintenance switch on the pit circuit board is short-circuited; the control cabinet safety board is actuated by the car top maintenance up button or the car top maintenance down button on the car top circuit board, and when the car top maintenance switch is actuated, the car top maintenance switch on the car top circuit board is short-circuited; the control cabinet safety board is actuated by the emergency electric up button or the emergency electric down button on the control cabinet circuit board, and when the emergency electric switch on the control cabinet circuit board is actuated, the emergency electric switch on the control cabinet circuit board is short-circuited.

9. The method for implementing a safety circuit according to claim 1, characterized in that: When any of the counterweight buffer switch and car buffer switch on the pit circuit board, the safety clamp switch on the car top circuit board, the upper limit switch on the control cabinet circuit board, the lower limit switch on the pit circuit board, and the speed limiter switch on the control cabinet circuit board are actuated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

10. A method for implementing a safety circuit according to claim 9, characterized in that: When the pit inspection switch on the pit circuit board and the car top inspection switch on the car top circuit board of the control cabinet safety board are not operated, and when the emergency electric switch on the control cabinet circuit board is operated, the counterweight buffer switch, car buffer switch and lower limit switch on the pit circuit board, the safety clamp switch on the car top circuit board, the upper limit switch and the speed limiter switch on the control cabinet circuit board are short-circuited, and any one of them is operated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

11. The method for implementing a safety circuit according to claim 1, characterized in that: When any of the tensioner switch on the pit circuit board, the telescopic guardrail switch on the car top circuit board, the maintenance platform fixing switch, the maintenance limit switch, the safety window switch, the front car door lock switch and the rear car door lock switch, and the front layer door lock switch and the rear door lock switch on the control cabinet circuit board of the control cabinet safety board is actuated, the dual-channel output safety circuit of the control cabinet safety board is disconnected.

12. The method for implementing a safety circuit according to claim 1, characterized in that: When the elevator main control board gives a door lock bypass instruction and the door zone switch on the car top circuit board is actuated, the control cabinet safety board short-circuits the front car door lock switch and the rear car door lock switch on the car top circuit board and the front floor door lock switch and the rear floor door lock switch on the control cabinet circuit board.

13. The method for implementing a safety circuit according to claim 1, characterized in that: When the car door lock bypass switch on the control cabinet circuit board is actuated, the control cabinet safety board short-circuits the front car door lock switch and the rear car door lock switch on the car top circuit board; when the floor door lock bypass switch on the control cabinet circuit board is actuated, the front floor door lock switch and the rear floor door lock switch on the control cabinet circuit board are short-circuited.

14. The method for implementing a safety circuit according to claim 1, characterized in that: Use the pit emergency stop switch, pit inspection switch, lower limit switch, car buffer switch, counterweight buffer switch, tensioner switch, car top emergency stop switch, car top inspection switch, safety clamp switch, telescopic guardrail switch, front car door lock switch, rear car door lock switch, inspection platform fixed switch, inspection limit switch, safety window switch, machine room emergency stop switch, emergency electric switch, speed limiter switch, front floor door lock switch, rear floor door lock switch, upper limit switch, turning handwheel switch, car door lock bypass switch and floor door lock bypass switch for moving and breaking contact detection; or The operator uses the pit emergency stop switch, pit maintenance switch, lower limit switch, car buffer switch, counterweight buffer switch, tensioner switch, car top emergency stop switch, car top maintenance switch, safety clamp switch, telescopic guardrail switch, front car door lock switch, rear car door lock switch, maintenance platform fixed switch, maintenance limit switch, safety window switch, machine room emergency stop switch, emergency electric switch, speed limiter switch, front floor door lock switch, rear floor door lock switch, upper limit switch, turning handwheel switch, car door lock bypass switch and floor door lock bypass switch to detect the moving and closing contacts.

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